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If条件状语从句
条件状语从句
定义
在复合句中做条件状语的句子，即表示假如从句动作的发生就会影响到主句动作的发生。“如果...就...”
注：句子⑴简单句
⑵复合句①主句（主语引导）
②从句（引导词引导，如if）
eg.If it rains tomorrow，we won't go to the zoo.
1.主句+if+条件状语从句
eg：I will go to his birthday party if he invites me.
If条件状语从句，主句（逗号隔开）
eg:If he invites me , I will go to his birthday party.
结构
If it stops raining,we can go outside.
主语含有情态动词can/could/must/should/may/might等时，从句用一般现在时。
主情从现
时态
If he runs,he won't be late for school.
主句是一般将来时,从句用一般现在时。
主将从现
时态
Don't play basketball if you don't finish your homework
主句是祈使句，从句是一般将来时。
主祈从现
时态
条件状语从句的引导词
①if 如果
②unless 除非 如果不相当于（if...not...）
③as long as 只要...就...
You won't pass the exam unless you work hard.
As long as you get up early,you will catch the bus.
引导词
If you study hard,you will pass the exam.
＝ Study hard,and you will pass the exam.
1.祈使句+and+简单句 and 表顺承“那么”
If you don't hurry up,you will be late.
＝Hurry up,or you will be late.
2.祈使句+or+简单句 or 表转折“否则”
几个重要的同义词转换
If you help me,I will finish my job soon.
＝With my help, will finish my job soon.
If there no water,fish may die.
＝Without water,,fish may die.
3.借助with和without
We will go for a picnic unless it rains tomorrow.
＝We will go for a picnic if it doesn't rain tomorrow.
4.unless与if...not...转换
主句将来时态中多用will,一般不用be going to
当if 表示是否时,从句不是条件状语从句，而是宾语从句,此时不遵循“主将从现”,从句该用什么时态就用什么时态。
Do you know if he will come to my birthday party tomorrow.（come）
两点注意
用括号内所给单词的正确形式填空
I'll buy a computer if I ______ （have） enough money.
I'm sure if he ______（go）to the parry,he ______（have）a great time.
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3.You __________（not got）nervous if you_______（do）enough exercise.
4.If she_______（finish）work early,she_______（go）home.
5.If it _______（rain）,we _______ （stay）at home.
1.Put up your hands if you _______（have）any questions.
2.If it _______（be）cold tomorrow,I will wear my sweater.
3.He can go home if he _______（finish）his homework.
1._______ we deal with our problems,we can easily become unhappy.（2014湖北十堰）
A.Until B.If C.Unless D.though
2.---Mrs.Li will be angry_______your students don't follow the rules in class？
---A little,but I will stop them in a friendly way.（2014山西）
A.if B.unless C.though
3._______ you drive,you mustn't drink wine at all.（2015山东菏泽）
A.Though B.If C.Unless
4. You will see many aunts dancing together on the square if it_______in the evening.（2015江苏连云港）
A.doesn't rain B.rains C.will rain D.won't rain
单项选择
含if条件状语从句的主从复合句
If 条件状语从句中,
主句用一般将来时，从句用一般现在时表示将来。
主将从现原则。
Summary
If you are ill,you must go to the doctor.
条件状语从句中,
主句有must,can,may等情态动词，从句用一般现在时。
主情从现原则。
If 条件状语从句中
主句是祈使句，从句用一般现在时表示将来。
主祈从现原则。
Bye-bye

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